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Max Maxfield

FPGA-Based World Globe Display

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Max Maxfield
Max Maxfield
8/14/2012 8:05:34 AM
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Re: Digital Maps
@Myplante: I've seen those also -- I think it's a university project somewhere -- you feed in the data and their software generates  world mapwith the size of the countries reflecting whatever you want them to -- I think that would be awsole on our 3D Globe Display -- you could morph from one set to another...

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Myplanet
Myplanet
8/14/2012 5:49:09 AM
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Re: Digital Maps
"I've also seen maps where the size of each country reflected something about that country, like average education, or average earnings, or average age ... very very interesting

Max, No idea. I had seen some other world maps based on resources like forest, natural ore, oil, population etc, each on separate maps. I think its difficult to incorporate all such things to a single map.



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Max Maxfield
Max Maxfield
8/10/2012 9:10:24 AM
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Re: Digital Maps
@Myplanet: I agree with what you say when it comes to flat maps -- there are a variety of dirrerent ways of creating such maps ("projections" I think they are called").

 

I've also seen maps where the size of each country reflected something about that country, like avereage education, or average earnings, or average age ... very very interesting.

 

It's only when you see the real projection on a 3D globe that you really get a good feel for how everything relates to everything else...

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Myplanet
Myplanet
8/10/2012 4:54:46 AM
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Re: Digital Maps
Max, I don't think maps are proportional to any scale or size. So the there won't be any correlation between the actual size and its representation at various mediums. According to geography, two- third of earth is covered by water, is it represent in the map: No. since peoples are more interested in knowing the places and directions, that part displayed well and I think forests are also not covered in map in its actual dimensions.

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Myplanet
Myplanet
8/10/2012 4:45:58 AM
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Re: Maximum responce
Max, yes I think most of the community members are more interested in knowing and discussing things in general rather than pure deep technical thoughts. During office hours, they may be get bored with all sort of technical issues and problems, so such common or general topics can get more mileage through our community site.

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Max Maxfield
Max Maxfield
8/6/2012 4:46:31 PM
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Re: Digital Maps
@David: Good point about the distortion. Re Africa -- I asked my 17-year old son yesterday whether he thought Africa was bifgger or smaller than the USA -- and he thought the USA was bigger ... you can only imagine his surprise when I showed him my globe...

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David Ashton
David Ashton
8/6/2012 4:46:08 PM
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Re: Something similar
Agreed Max, and it shows that you'd need a big globe / lots more LEDs / LOTS of power to do this with LEDs....

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Max Maxfield
Max Maxfield
8/6/2012 4:44:18 PM
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Re: Thousands of LEDs
@David: I want the same level of resolution you can get on a Kindle or an iPad -- I scoff at a mere 650 LEDs around the equator (ha!)

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David Ashton
David Ashton
8/6/2012 4:40:28 PM
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Re: Thousands of LEDs
A 3-foot ball would be about the minimum you could use LEDs for and get a reasonable resolution.  I don't know if you can get 3mm RGB leds but you can get 4.8mm ones - you'd get around 650 around the equator of a 3 foot globe and you'd need over 300 000 of them for the whole thing.  Huge expense and power consumption, but it would look good in Times Square.....

....but yes on this size globe you'd have ample room to put a few pico projectors in at the centre.  Do you know what their maximum angular projection is - you could use this to work out how many you'd need.  You could also use a LOT of touch screens on something this size and it wouldn't look too bad.

While I was thinking about this I came up with another idea - get 6 square touch screens (if such things exist - I think most are rectangular) - and make a cube of them.  You could then make an electronic Rubik's cube.  Use your fingers to drag one or two bands around at a time.  Gravity switch or timer for on/off and a cunningly disguised reset switch for dummies like me who can't do it.....  You could use it as a digital alarm clock / photo display / etc when not rubik-ing. 

I guess you could also do this cheaply with LEDs, and have touch contacts poking up between the LEDs for the sensing...but then you have power issues.....and no photos....

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David Ashton
David Ashton
8/6/2012 4:12:04 PM
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Re: Digital Maps
The other nice thing about a globe is that the scale is not distorted at the poles.  Have a look at the continental drift video above and note how distorted things are at the top and bottom.  There are projections (I didn't realise how many - try "Map Projections" on Wikipedia) that overcome this- kind of like peeling an orange and flattening it out - but they are usually "cut" where the oceans are now, and that was not always the case.  A continental drift display on something like that would look a bit silly.

The discrepancy between the size of Africa on the globe and on a map is really the other way around.  Africa is roughly centred on the equator whereas North America and Eurasia extend far more to the north - so they look really big at the top on a flat map and much smaller on a globe, wheras Africa stays more or less the same.   (I reckon this is why North America and Russia play such a large part in world affairs - they think they are bigger than they really are... :-)

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